Back-to-back CGT rollovers: What draft PCG 2026/D5 means for business restructures

The Australian Taxation Office (ATO) has released Draft PCG 2026/D5 – Back-to-back capital gains taxation (CGT) rollovers and Part IVA, setting out its compliance approach to transactions involving successive CGT rollovers. The Guideline is particularly relevant to businesses undertaking multi-step restructures before raising capital, admitting investors, making acquisitions or otherwise changing their ownership structure.

When does the ATO see greater risk?

The ATO does not suggest that successive rollovers are inherently ineffective. Instead, its focus is on arrangements where the rollovers are interdependent, an intermediate step has limited commercial or practical utility, and the sequence produces a tax outcome that would not have arisen under a more direct transaction. Examples include deferral of a capital gain, an increased cost base and increased deductions.

Transactions are more likely to be lower risk where each step has an independent commercial or practical purpose. Importantly, a higher-risk classification does not itself mean Part IVA applies.

Part IVA remains a facts-and-circumstances enquiry

This distinction is important because Part IVA requires more than identifying a tax benefit. Section 177D requires the purpose conclusion to be determined having regard to specified factors, including the manner, form and substance and timing of the scheme, its tax consequences and changes in the financial positions of the taxpayer and connected persons.

The PCG's examples do not examine each of those factors in detail. Taxpayers considering transactions within the higher-risk zone will therefore need to undertake that analysis separately.

Recent cases provide some useful context. In Commissioner of Taxation v Merchant; Merchant v Commissioner of Taxation [2026] HCA 39, the High Court upheld the application of Part IVA to a transaction generating a substantial capital loss, but reaffirmed that taxpayers are not required to choose the course producing the greatest amount of tax. The existence of a more highly taxed means of achieving the same or a similar commercial outcome does not, by itself, establish Part IVA.

Similarly, AusNet Services Limited v Commissioner of Taxation [2025] FCAFC 21 illustrates that sequential and interdependent transactions can form part of an integrated commercial reorganisation while engaging the intended operation of statutory rollover provisions. The Commissioner had previously considered Division 615 and Part IVA in Class Ruling CR 2015/45 concerning the AusNet restructuring.

Deferral versus changing tax attributes – BDO perspective

An aspect which the draft PCG does draw out is the important distinction between deferring an accrued gain and permanently changing tax attributes. Where successive rollovers preserve the owners' underlying economic exposure and carry an embedded gain forward for taxation on a later disposal, there may have been no corresponding economic realisation or extraction of value. This differs from arrangements which uplift cost base or depreciable values, potentially eliminating an existing gain or creating additional future deductions.

The latter outcomes, reflected in some of the PCG's higher-risk examples, plainly present more evident integrity concerns. In a pure deferral case, however, the absence of economic realisation and preservation of the underlying tax exposure are relevant circumstances in applying the 177D factors. 

It is the latter outcome which would appear to be the true mischief underlying the ATO’s concerns and accordingly, it would be submitted that it is those arrangements where a finalised PCG’s attention should be primarily directly to, rather than deferrals of capital gains where there is no economic realisation of that gain.

Documentation will be important

The PCG accordingly places considerable emphasis on contemporaneous records explaining why transactions were undertaken and why a particular structure was selected, including valuations, negotiations, transaction documents and relationships between relevant parties.

Hilton International Australia Pty Ltd v Commissioner of Taxation (No 2) [2026] FCA 1325 reinforces the practical importance of this evidence. Contemporaneous documentation concerning the reasons for the selected structure was significant to the Court's Part IVA analysis.

Businesses undertaking multi-step restructures should therefore document not merely that a commercial objective exists, but why each material step is being undertaken and how the selected structure advances that objective.

Particular implications for growing businesses

The PCG may be particularly relevant to small-to-medium enterprises transitioning into larger enterprises. Growing businesses frequently need to replace structures established at an earlier stage to accommodate external equity, private capital, employee ownership, acquisitions, division of business activities or an eventual liquidity event.

Where no single rollover accommodates that transition, multiple rollovers may arise from the design of the tax legislation rather than the commercial complexity of the transaction. Distinguishing tax-driven complexity from tax-law-driven complexity will therefore be important.

A catalyst for broader CGT rollover reform?

The PCG also provides timely context for reconsidering the Board of Taxation's work on a principles-based general business restructure rollover intended to rationalise Australia's transaction-specific rollover provisions.

A general rollover, supported by appropriately targeted integrity rules, could provide a clearer framework: preserve accrued gains where economic ownership and tax values genuinely continue through a commercial restructure, while targeting arrangements that manufacture cost base, deductions or other permanent tax advantages.

For growing Australian businesses, that may ultimately provide greater certainty than requiring commercially driven restructures to navigate multiple specific rollover provisions, followed by a separate consideration of the potential application of Part IVA.

How BDO can help

If the Draft PCG 2026/D5 rollovers and Part IVA will impact your business, our tax experts can help you identify potential risks and strengthen your supporting evidence.